Ukraine said a Russian drone crashed into the containment structure, starting a fire, but so far radiation levels have stayed constant.

A fire continues at the Chernobyl Nuclear Power Plant after a strike on the shelter of the destroyed fourth reactor. As of the morning of February 15, no radiation threat has been detected, according to the State Agency of Ukraine for the Management of the Exclusion Zone on Facebook.

CHERNOBYL NUCLEAR POWER STATION, Ukraine (AP) — A drone armed with a warhead hit the protective outer shell of Ukraine’s Chernobyl nuclear plant early Friday, punching a hole in the structure and briefly starting a fire, in an attack Kyiv blamed on Russia. The Kremlin denied it was responsible.